Abstract
Activator-doped noncentrosymmetric (NCS) bismuth tellurite solid solutions, Bi2−xLnxTeO5 (Ln = Ce and Eu), have been successfully synthesized by solid state reactions. Crystal structure determination by powder X-ray diffraction using Rietveld method suggests that the solid solutions crystallize in the polar space group, Abm2 with pseudo-three-dimensional frameworks consisting of asymmetric polyhedra. Powder nonlinear optical (NLO) measurements, using 1064 nm radiation, reveal that the origin of large second-harmonic generation (SHG) efficiency of Bi2−xLnxTeO5 is the polarization arising from the alignment of lone pair cation, Bi3+. Photoluminescence (PL) intensity of Bi1.9Ce0.1TeO5 increases as temperature increases attributed to the greater occupation of the higher excited state. PL intensity of Bi1.9Eu0.1TeO5, however, increases as temperature decreases attributable to the distinct emission mechanisms at different temperatures. PL measurements also strongly suggest that the Bi3+ sites are in unsymmetrical coordination moieties within the framework.
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